Suppose you have a company with four markets in four regions (eg China, United States, United…

Suppose you have a company with four markets in four regions (eg
China, United States, United Kingdom, Japan). The distribution of
their sales is a normal distribution with a mean of 100 and a
standard deviation of 0.5. What is the distribution of the total
market, and what are the mean and standard deviations? If the four
markets are not independent, what is the distribution?